swain



2 Sheets-Sheet 1.

(lo Model.)

D. M. SWAIN. Boilers for Portable Engines. No.v234,627. Patented Nov. 16,1880.

uuml/Annulla 2501/ e nib/rt:

H. PETERS. PMOTD-LITHDGRAPf-ren, WASHINGTON. D C,

2 Sheets-Sheet' 2` (H0 Model.)

D M SWAIN Boilers for Portable Engines. ,627.

No. 234 Patented Nov. 16,1880.

Wil-mauves'.-

N. PETERS PHDTO-LITHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OEEicE.

DAVID M. SWAIN, OF STILLI/VATER, MINNESOTA, ASSIGNOR OF TIVO-THlRDS TO SEYMOUR, SABIN 85 OO., OF SAME PLAGE.

lBOlLER FOR PORTABLE ENGINES.

SPECIFICATION forming part of Letters Patent No. 234,627, dated November 16, 1880.

Application filed September 1, 1880. (No model.)

To all whom it may concern.' From Figs. 1 and 3 it will be seen that the Be it known that I, DAVID M. SWAIN, of wallofthere-boxisso surroundedbythe outer Stillwater, in the State of Minnesota, have inwall, A, of the boiler that the water shall be vented certain new and useful Improvements in -contact with the tire-box, not only at its up- 5 5 5 in Boiler-Furnaces for Portable Engines; and per side, but also in the rear of the box, as

I do hereby declare the following to be a full, shown at A2, and at the sides of the'box, as clear, and exact description of the invention, shown at A3 A3. such as will enable others skilled in the art to At the bottom of the lire-box the fire-grate which it appertains to make and use the same, O is placed. It is formed of several (prefer- 6o ro referencebeing had to the accompanying drawably two) sections, which are provided with ings, and to letters of reference marked therejournals c c, projecting from the outer crosson, which form a part of this speciflcation. bars of the grate-section, and journals c c on Figure 1 is a longitudinal section of my iinthe inner cross-bars. rBhe journals c c are proved boiler-furnace, and of a boiler commounted in a bracket or suitable support, C, 65 15 bined therewith, some of the ordinary parts of at the inner end of the nre box, and the an engine being also shown. Fig. 2 is an end journals c c are mounted in apertures or bearview. Fig. 3 is a transverse vertical section ings formed in the front wall of the box. through the furnace and boiler. Fig. t is a G3 C3 are spur-wheels of equal diameter, atvertical longitudinal section of the devices for tached, respectively, to the outer ends ot' jour- 7o zo supplying water to the furnace ash-box. Fig. nals c c. The wheels mesh with each other, 5 is a perspective view of the furnace-grates. and by means of crank c2, attached to one of One part of the invention relates to the comthem, they can be rotated so as to simultanebination, with the furnace, of an improved deously turn the grate-sections O O, and thus vice for guiding the fuel as it is being introthe ashes and cinders can beinstant-ly dropped 7v 25 duced. into the ash-pan D.

. Another part of the invention relates to the I am aware that heretofore use has been combination, with the furnace lire-box, of a made of gear wheels in combination with front wall for said box, provided throughout grates, each of which was constructed withV with perforations, whereby currents of air are four or more radial plates, and I do not claim 8o 3o introduced to prevent the ashes from escaping such construction as my invention; but it will upwardly from the furnace. be seen that both sections ot' my improved Another part ofthe invention relates to the grate are situated in the same horizontal plane combination, with the furnace and the rewhen in use, and therefore that when they are flues, of a peculiarly-constructed returningrotated or tilted there is no danger of catc'h- 85 3 5 chamber at the front end of the boiler. ing cinders or masses of hard matter between Another part of the invention relates to the them, and thus prevent their being emptied. combination, with the furnace, of a peculiarly- Each grate has but two wings extendingfrom constructed ash-box situated directly beneath the axial line. the lire-box and arranged to hold a body of This ash-pan is constructed with the cen- 9o 4o water for .quenching the ashes. tral part, d, of the bottom substantially hori- Another part of the invention relates to the Zontal, and the end parts, d d", somewhat incombination,with the furnace and the ash-box, clined, so as to have a shallow receptacle which of a peculiarly-constructed feed-water heater shall hold a quantity of water sufcient to and devices for conducting the water of conquench the ashes, and from which the ashes 9 5 4 5 densation from said heater to the ash-box. can be readily removed by a rake, D.

The invention relates also to various detail D2 Dare openings at the ends of the ashimprovements, which shall be hereinafter fully pan through which the rake can be inserted set forth. and the refuse can be withdrawn.

In the drawings, A represents the tire-box, The means which I have devised for givin g roo 5o situated at the rear end of the boiler and cona constant supply of water to the ash-pan will structed as large as possible. be fully described hereinafter.

When wood or coal is to be used as fuel, the ordinary door E, hinged to the front of the rebox, is employed. When straw is to be used as fuel, a feed-funnel, E', is secured in place in the doorway, and through the funnel the straw is introduced. When the straw is passed into the fire-box on horizontal lines it tends to be carried so far toward the inner end of the box as to interfere very largely with perfect combustion. In order to obviate this I have devised a feed-funnel which shall guide the straw directly downward toward the outer end of the grate as soon as it has entered the box.

By examining Fig. l it will be seen that the top or upper wall of the funnel is curved downward to a line on or below the center of the funnel, and that the bottom orlower wall does not extend beyond or inside of the front of the hre-box. This construction permits the easy insertion of the straw, and at the same time guides it directly downwardly toward the outer end of the grate, insuring that the fuel shall be subjected to the action of combustion to the greatest extent possible. Moreover, I have found, when using the devices inthe relation deseribed,that thestraw is ignited before reaching the grate, and this early igniting obviates a defect very common in straw-burning en,

gilles-namely, the leaving of hard lumps of unburned straw.

The front wall, F, is provided with perforations ff, situated closely together over the whole of the front, and the air necessary for supporting combustion is supplied through these perforations. When air is thus supplied no ashes or light einders are suspended in the fire-box or carried to the ireiiues or boilerflues, as is the case when combustion is supported by a strong upward draft through the grates. The front F is also provided with a sliding draft-door, F.

In order to utilize to a greater extent than has heretofore been done allof the heat generated below the boiler, I have devised a peculiar construction and arrangeinentof fire-fines and boiler-ducs. rlhe fire-box is provided with an arched top, as shown at A4. Vith the arched part of the box a large fire-flue, G, is arranged to communicate. This fire-line is made tubular in order to make available as much heating-surface as possible. I combine with the central flue, G, supplemental lateral tire-fines G, which are also tubular in form, and they enable me to utilize, for heating the water in the boiler, the products of combustion as they leave the lire-box At the front end of the engine I attach a returning device of peculiar construction, as shown at I. It is a tight chamber which is at the bottom of a width equal to the outside distance of the supplemental tlre-flues G G, and is constructed to expand both laterally and outwardly as it is carried up, so as to deliver the products of combustion to the returnfines with the least exposure and waste. Moreover, it is so formed that its inner surface at all points shall be curved, as shown in the drawings, and without any angles or corners to catch the ashes or ciuders. Should any ashes or other undesirable material settle in. the returning-chamber they will at once be carried down to` the fire-flue, (owing to the nature of the inner surface described,) whence they can be readily withdrawn. As the wall I of the returning-chamber I is cornerless and rounded in the manner shown, the currents from the re-flues pass through the chamber to the return-dues uniformly and with but little resistance.

N represents a box or chamber of a length nearly equal to that of the engine, and attached thereto immediately below the steam chest and cylinder. It is divided into two compartments by the partition N extending longitudinally over a greater part of the interior of the heating-box N. It is provided with a port, fn, communicating with the exhaust-port of the engine and arranged to admit the exhaust-steam to the upper of the compartments.

O is a discharge-pipe communicating with the lower of the chambers in the heating-box, and with the smoke-stack by an `upwardlyinclinedportion, O. The exhaust-steam passes along the upper chamber to the throat n', whence it passes back Vin the opposite direction, through the lower chamber and through the discharge-pipe 0, to the smoke-stack. The pipe O passes into the chamber at a point considerably below the bottom, so that no water of condensation can pass to the smoke-stack. Said water of condensation is conducted to an orifice, Q, beneath the port a, from which it is carried by a pipe, R, to the ash-pan.

By means of these devices I am enabled to furnish the ash-pan with a constant supply of water to take the place of that lost by evaporation and otherwise. y

The returning-chamber I is so arranged that the inner surface of the bottom part is substantially coincident with the bottom of the central tire-flue, Gr, so as to insure that the cinders and other heavy particles that may reach said chamber shall fall back to the fire-flue, from which they can be readily withdrawn.

I do not herein claim any of the specific improvements in the boiler which I may have shown, as I prefer to make these the subjectmatter of another application.

What I claim isl. In a portable engine, the combination, with the boiler-furnace having the front vertical wall, F, of the detachable feed-funnel E', when constructed to have the upper wall curved downward and the bottom or lower wall extended to but not beyond the front wall of the fire-box, as Set forth.

2. In aportable engin e, the combination, with the boiler-furnace, of the front wall, F, when it is provided throughout with perforationsff, substantially as and for the purposes set forth.

3. In a portable engine, the combination, with a boiler-furnace, of the ash-receptacle D, which IOO IOS

IIO

the feed-Water heater N, of devices arranged to conduct the Water of condensation from the feed-water heater to said ash-receptacle, substantially as set forth.

In testimony that l claim the foregoing l have hereunto set my hand.

DAVID M. SWAIN.

Witnesses WAYLAND S. GOODHUE, LEVI G. PRooToR. 

